Watermelon and melon seed buying guide

Choose the Right Watermelon and Melon Seeds

Watermelons, rockmelons and honeydew melons are warm-season cucurbit crops grown for sweet, refreshing fruit. Varieties differ in vine length, fruit size, skin pattern, flesh colour, sweetness, maturity, disease performance and suitability for household gardens, compact spaces, fresh markets or commercial production.

Seedmart supplies watermelon and melon seeds for home gardeners, market gardeners and commercial growers throughout Australia. Choose Sugar Baby or Bush Jubilee for more manageable plants and fruit, Crimson Sweet Warpaint or Charleston Grey for larger watermelons, Hales Best or Planters Jumbo for aromatic rockmelon, or green-fleshed and F1 honeydew varieties for smooth-skinned dessert fruit.

The best watermelon or melon seed will depend on your climate, available growing space, preferred fruit size, harvest period, seed treatment requirements and intended household or commercial use.

Why Grow Watermelons and Melons?

Suited to Warm Weather

Watermelon, rockmelon and honeydew grow vigorously through warm, frost-free conditions.

Different Fruit Types

Choose crisp watermelon, aromatic rockmelon or smooth-skinned honeydew according to flavour and market preference.

Compact Options Available

Bush and smaller-fruited watermelon varieties can suit raised beds and gardens with limited spreading room.

Fresh Summer Fruit

Use ripe melons chilled, sliced, in fruit salads, drinks, desserts, salsas and savoury dishes.

Ground or Trellis Growing

Allow vines to spread across open ground or train smaller-fruited melons onto strong supports.

Packet and Bulk Seed

Choose smaller quantities for household gardens or larger packs for repeated and commercial plantings.

Watermelon and Melon Seeds for Different Growing Goals

Some melons are selected for compact plants and smaller fruit, while others are grown for fruit size, storage, sweetness, aroma or commercial uniformity.

Growing Goal Recommended Varieties or Types Why Choose Them?
Smaller watermelon fruit Sugar Baby Produces compact, round, dark-skinned watermelons with manageable household fruit size.
Reduced vine spread Bush Jubilee A bush-type watermelon suited to growers seeking more controlled growth than vigorous trailing varieties.
Classic striped watermelon Crimson Sweet Warpaint Produces rounded striped fruit with red flesh and a familiar watermelon appearance.
Large elongated watermelon Charleston Grey Develops substantial oblong fruit with pale grey-green skin and red flesh.
Traditional aromatic rockmelon Hales Best Produces netted fruit with fragrant orange flesh for fresh eating and desserts.
Larger rockmelon fruit Planters Jumbo Selected for substantial netted fruit and commercial-style rockmelon production.
Traditional green honeydew Green Flesh Honeydew Produces smooth-skinned fruit with pale green, sweet and refreshing flesh.
Uniform F1 honeydew production Callisto F1 and Triton F1 Hybrid varieties selected for consistent growth and fruit characteristics.
Market garden production Variety selected for customer and transport requirements Watermelon, rockmelon and honeydew serve different retail, restaurant and wholesale markets.

Choose Melons by Fruit Type

Watermelon

Red-Fleshed Watermelons

Watermelons develop crisp, high-moisture flesh inside a firm rind. Fruit size ranges from compact Sugar Baby types to large Charleston Grey melons.

Bush Watermelon

Compact-Growing Watermelons

Bush-type varieties develop shorter, more controlled vines and can suit raised beds or smaller growing areas.

Rockmelon

Rockmelon or Cantaloupe

Rockmelons produce aromatic orange flesh inside a netted rind and are generally harvested once fully mature.

Honeydew

Green-Fleshed Honeydew

Honeydew melons develop smoother skin and crisp, juicy, mildly aromatic flesh.

Open-Pollinated

Traditional Melon Varieties

Open-pollinated varieties can be suitable for growers seeking traditional fruit characteristics and potential seed saving.

F1 Hybrid

Uniform Commercial Melons

F1 hybrid melons are selected for uniform first-generation growth, fruit quality and commercial performance.

Watermelon, Rockmelon and Honeydew

These crops have similar warm-season requirements but produce distinctly different fruit.

Melon Type General Characteristics Harvest Characteristics
Watermelon Firm outer rind containing crisp, juicy red, pink, yellow or orange flesh depending on variety. Harvested when the fruit is mature, the ground spot changes colour and the nearby tendril dries.
Rockmelon or cantaloupe Aromatic orange or green flesh inside a netted or textured rind. Many varieties develop strong aroma and begin separating from the stem when ripe.
Honeydew melon Smooth-skinned fruit with pale green, white or orange flesh depending on variety. Rind colour, aroma, blossom-end softness and days from flowering help indicate maturity.
Cucamelon Small grape-sized fruit with striped skin and a cucumber-like, lightly acidic flavour. Picked while firm and crisp; not grown or harvested like a full-sized dessert melon.
Watermelon, rockmelon and honeydew do not ripen in exactly the same way. Use variety-specific maturity indicators rather than applying one harvest test to every melon crop.

Is Rockmelon the Same as Cantaloupe?

In Australia, the term rockmelon is commonly used for netted dessert melons that may be called cantaloupe or muskmelon in other countries.

The words are often used interchangeably in ordinary retail and gardening language. Botanical and international naming can be more precise, but Australian growers generally understand rockmelon as an aromatic, netted melon with orange or occasionally green flesh.

Australian Usage Common International Usage
Rockmelon Cantaloupe or muskmelon
Netted rind Netted or textured melon rind
Usually orange aromatic flesh Orange or green flesh depending on type
Common fresh-market term Regional terminology varies

Watermelon vs Rockmelon

Watermelon and rockmelon are related cucurbits, but they differ in fruit texture, aroma, rind and harvest behaviour.

Watermelon Rockmelon
Produces crisp, watery flesh inside a thick firm rind. Produces softer, aromatic flesh inside a netted rind.
Generally has little fragrance through the intact rind. Ripe fruit commonly develops a noticeable sweet aroma.
Does not naturally separate from the vine at full maturity. Many varieties develop a slip layer and release more readily from the stem.
Ripeness is assessed using the ground spot, tendril, rind and sound. Ripeness is assessed using aroma, rind colour, stem slip and slight softness.
Requires substantial ground space for vigorous vines. Can often be trellised where individual fruit is supported.

Honeydew vs Rockmelon

Honeydew and rockmelon are both dessert melons, but they differ in rind texture, flesh and ripening characteristics.

Honeydew Rockmelon
Generally develops a smooth or lightly textured rind. Generally develops a strongly netted rind.
Commonly has pale green or white flesh. Commonly has orange aromatic flesh.
Flavour is sweet, mild and refreshing. Flavour is sweet, fragrant and musky.
May not separate freely from the vine when ripe. Many types develop partial or full slip at maturity.
Often requires close attention to rind colour and blossom-end softness. Aroma and stem separation are useful harvest indicators.

Open-Pollinated vs F1 Hybrid Melons

Open-pollinated and hybrid melons are produced through different breeding systems.

Open-Pollinated Melons F1 Hybrid Melons
Can generally produce recognisable true-to-type seed where crossing is prevented. Produced by crossing selected parent lines to create the first hybrid generation.
May include traditional and heirloom varieties. Often selected for fruit uniformity, yield or particular commercial traits.
Can display some natural variation between plants and fruit. Usually produces a more uniform first-generation crop.
Suitable for growers interested in seed saving. Saved seed does not reliably reproduce the original F1 variety.
Includes Sugar Baby, Charleston Grey and traditional melon varieties. Includes products such as Callisto F1 and Triton F1 honeydew.

How to Grow Watermelon and Melons in Australia

Watermelons and melons require full sun, warm soil, fertile free-draining ground, reliable moisture and a sufficiently long frost-free growing season.

Wait for Warm Soil

Plant after frost risk has passed and the soil is warm enough for rapid germination and root growth.

Provide Full Sun

Choose an open position receiving at least six to eight hours of direct sunlight.

Allow Vine Space

Provide open ground, wide rows or strong supports for vigorous spreading vines.

Support Pollination

Male and female flowers require reliable pollen transfer for properly developed fruit.

Melons need sustained warmth. Late planting can leave fruit immature when cool weather arrives, while cold soil can cause poor germination and slow establishment.

When to Plant Watermelon and Melons in Australia

Plant melons during warm, frost-free conditions. Tropical and subtropical growers have a longer planting window than gardeners in cool southern districts.

Climate Zone General Sowing Period Growing Notes
Cool October to December Plant after frost and select varieties capable of maturing within the available summer.
Temperate September to December Spring and early summer sowing generally provides enough warm weather for fruit development.
Subtropical August to February Plant through the warm season while allowing for heavy rain, humidity and disease pressure.
Tropical February to September Dry-season production can provide more manageable rainfall, disease and fruit-quality conditions.
Arid August to January Provide dependable irrigation and protection from severe drying winds and extreme heat.

These planting periods are general guides. Local frost dates, soil temperature, humidity, rainfall, irrigation and the maturity period of the selected variety should also be considered.

When to Plant Watermelon in Australian States and Cities

Regional planting dates should be adjusted according to frost risk, soil warmth and the expected length of summer.

Location General Planting Guide Key Considerations
Brisbane and South East Queensland August to February Spring planting supports vigorous growth, while later crops require good drainage during humid weather.
Sydney and coastal New South Wales September to December Wait until soil temperatures rise and allow sufficient time for fruit to mature before autumn.
Inland New South Wales October to December Plant after frost risk and maintain irrigation through hot, dry periods.
Melbourne and Victoria October to December Use the warmest available season and consider raising seedlings under protection.
Canberra and cool inland districts October to November Plant early after frost and select relatively fast-maturing varieties.
Adelaide and South Australia September to December Provide deep watering and mulch through dry summer conditions.
Perth and south-west Western Australia September to December Spring planting allows vines to establish before the hottest summer weather.
Tasmania November to December Use an early variety and the warmest, most sheltered position available.
Darwin and tropical northern Australia February to August Dry-season planting generally reduces waterlogging and excessive fungal pressure.

How to Grow Watermelon from Seed

Watermelon and melon seeds can be direct-sown into warm soil or raised in individual pots before transplanting.

  1. Choose a warm, sunny position.
    Allow enough space for mature vines and fruit.
  2. Prepare fertile, free-draining soil.
    Incorporate suitable compost or organic matter where required.
  3. Wait for adequate soil warmth.
    Avoid sowing into cold, saturated ground.
  4. Sow at the correct depth.
    Plant melon seeds approximately 2–3 cm deep.
  5. Maintain moderate moisture.
    Keep the soil moist without continually saturating the seed.
  6. Thin or transplant seedlings.
    Retain the strongest plants and avoid disturbing their roots unnecessarily.
  7. Direct the vines.
    Guide growth into open ground or onto a strong trellis.
  8. Maintain water and nutrition.
    Support flowering, pollination and fruit expansion.
  9. Protect developing fruit.
    Keep fruit away from persistently wet soil and support trellised melons.
  10. Harvest at full maturity.
    Use the correct ripeness indicators for watermelon, rockmelon or honeydew.
Avoid root disturbance. Melon seedlings establish most successfully when transplanted young with the root ball intact.

How Deep Should Watermelon Seeds Be Planted?

Plant watermelon and most melon seeds approximately 2–3 cm deep.

Heavy or Cool Soil

Use the shallower end of the range and wait for suitable warmth.

  • Sow approximately 2 cm deep
  • Avoid compacting the soil
  • Do not plant into waterlogged ground
  • Protect emerging seedlings from pests

Light or Rapidly Drying Soil

Slightly deeper planting can help maintain moisture.

  • Sow approximately 2–3 cm deep
  • Water thoroughly after planting
  • Monitor rapid surface drying
  • Avoid excessive burial

How Long Do Watermelon Seeds Take to Germinate?

Watermelon and melon seeds commonly germinate within approximately 5–12 days under warm conditions.

Soil Temperature

Warm soil supports rapid germination and vigorous early growth.

Drainage

Cold, saturated soil can cause seed to decay before emergence.

Moisture

Maintain even moisture without applying repeated excessive water.

Seed Vigour

Fresh, correctly stored seed generally establishes more uniformly than old or damaged seed.

Should Watermelon Seeds Be Soaked Before Planting?

Soaking is optional. Watermelon and melon seeds generally germinate successfully when planted directly into warm, evenly moist soil.

A short soak may help hydrate particularly firm seed. Drain the seed and plant it immediately.

Do not soak seed for an extended period or place presoaked seed into cold, waterlogged ground.

Warm soil matters more than soaking. Seed can still rot after soaking where drainage and temperature are unsuitable.

Can Watermelon Seedlings Be Transplanted?

Yes. Watermelon and melon seedlings can be transplanted while young, but their roots should be disturbed as little as possible.

Raise one plant in each individual pot or deep cell. Transplant after several true leaves develop but before roots become densely pot-bound.

Harden seedlings gradually and plant them at approximately the same depth they occupied in the container.

How Far Apart Should Watermelons and Melons Be Planted?

Spacing depends on vine habit, fruit size, trellising and production system.

Melon Type Approximate Plant Spacing General Guidance
Bush watermelon Approximately 60–100 cm Suitable for compact bush varieties where vine spread is more controlled.
Small-fruited trailing watermelon Approximately 90–150 cm Allow vines to spread across open soil or wide beds.
Large watermelon varieties Approximately 150–250 cm Provide generous vine space and access for fruit inspection and harvest.
Trellised rockmelon or honeydew Approximately 45–90 cm Train plants vertically and support individual fruit.
Ground-grown rockmelon or honeydew Approximately 90–150 cm Allow sufficient room for branching vines and fruit development.
Commercial rows Adjusted to variety and machinery Row width should allow irrigation, disease management and harvest access.

How Much Space Do Watermelon Vines Need?

Watermelon vines commonly extend approximately 2–5 metres. Vigorous large-fruited varieties may grow farther under favourable conditions.

Bush Jubilee and other bush varieties have a more compact habit but still require substantial leaf area, sunlight and root space.

Vine length is affected by:

  • Variety
  • Temperature
  • Soil fertility
  • Water availability
  • Plant spacing
  • Fruit load
  • Length of the growing season

Can Watermelon Be Grown in Pots?

Watermelon can grow in containers, but compact or smaller-fruited varieties are the most practical choices.

Container Requirements

Use one large and stable container for each plant.

  • Allow approximately 50–100 litres or more
  • Provide at least 40–50 cm of soil depth
  • Use unrestricted drainage holes
  • Allow room for vines or provide a strong trellis

Container Management

Potted melons require close water, fertility and support management.

  • Use fertile, good-quality potting mix
  • Check moisture frequently during hot weather
  • Feed according to crop growth
  • Support trellised fruit with slings

Can Watermelons and Melons Grow on a Trellis?

Rockmelon, honeydew and smaller watermelons can be trained onto strong trellises.

Large-fruited watermelons are generally easier to manage on the ground because of their weight.

A melon trellis should:

  • Be firmly anchored
  • Use rigid mesh or strong framing
  • Provide attachment points for tendrils
  • Allow access for pollination and pruning
  • Carry the mature weight of vines and fruit
  • Support each developing melon with a breathable sling

Watermelon and Melon Flowers

Most watermelon and melon plants produce separate male and female flowers on the same vine.

Male flowers commonly appear first. Female flowers have a small immature fruit behind the petals.

Male Flower Female Flower
Grows on a narrow stem. Has a miniature melon beneath the petals.
Produces pollen. Receives pollen.
Usually appears first and in greater numbers. Appears after the vine has developed sufficient growth.
Falls without producing fruit. Develops into fruit after successful pollination.

Do Watermelons Need Bees for Pollination?

Bees and other pollinating insects are important for watermelon and melon fruit set.

A female flower generally requires multiple pollen visits for complete fertilisation. Poor pollen transfer can cause fruit to remain small, become misshapen or fall from the vine.

Support pollination by:

  • Growing flowers that attract bees nearby
  • Avoiding unnecessary insecticide use during flowering
  • Applying permitted crop-protection products outside peak bee activity
  • Maintaining healthy male and female flowers
  • Hand-pollinating where natural activity is inadequate

How to Hand-Pollinate Watermelon and Melon Flowers

Hand pollination can improve fruit set where bees are scarce.

  1. Identify a newly opened male flower.
    Choose one with visible pollen and no small fruit beneath it.
  2. Locate an open female flower.
    Look for the miniature melon behind the petals.
  3. Transfer the pollen.
    Remove the male petals and touch the pollen-bearing centre against the female flower.
  4. Pollinate early in the morning.
    Flowers are generally freshest and most receptive shortly after opening.
  5. Use pollen from more than one flower.
    Generous pollen coverage can improve fruit development.

Why Are Small Watermelons Falling Off?

Poor pollination is the most common cause of small fruit yellowing and falling shortly after flowering.

Other possible causes include:

Incomplete Pollination

Insufficient pollen can cause fruit to stop developing or become misshapen.

Water Stress

Dry or waterlogged roots can cause flowers and young fruit to abort.

Temperature Extremes

Cold or severe heat can affect flowers, pollen and early fruit growth.

Immature Vines

Young plants may not have enough leaf area to support developing fruit.

Excessive Nitrogen

Strong leafy growth can occur at the expense of fruit production.

Heavy Fruit Load

Plants may abort later fruit where several melons are already developing.

Should Watermelon Vines Be Pruned?

Pruning is optional in most household gardens. Healthy plants can produce without regular pruning where sufficient space is available.

Light pruning may be useful where vines:

  • Grow into paths or neighbouring crops
  • Become excessively tangled
  • Extend beyond the available bed
  • Continue forming very late fruit that cannot mature
  • Develop diseased or damaged foliage

Avoid removing excessive healthy leaves because the foliage produces energy and protects fruit from sunscald.

How Long Does Watermelon Take to Grow?

Watermelon commonly requires approximately 70–110 days from sowing to mature fruit.

Melon Group Typical Period General Characteristics
Small or early watermelon Approximately 70–90 days Smaller fruit and shorter maturity can suit limited warm seasons.
Medium watermelon Approximately 80–100 days Includes many common round and striped garden varieties.
Large watermelon Approximately 90–110 days or more Large fruit generally requires a longer period of sustained warmth.
Rockmelon Approximately 70–100 days Aromatic fruit develops after successful flowering and pollination.
Honeydew Approximately 80–110 days Fruit generally requires time to develop full sweetness and mature rind colour.

Growing time varies with variety, temperature, sunlight, pollination, water, soil fertility and fruit load.

How Long Does Watermelon Take to Mature After Flowering?

A successfully pollinated watermelon commonly requires approximately 35–50 days to mature.

Rockmelon and honeydew maturity periods after flowering vary by variety but often fall within a similar general range.

Record the flowering or fruit-set date where accurate harvest timing is important. Combine elapsed time with visual maturity indicators rather than relying only on calendar days.

When to Harvest Watermelon

Watermelon does not become substantially sweeter after harvesting, so it should remain on the vine until fully mature.

Useful maturity indicators include:

  • The tendril nearest the fruit stem becomes brown and dry
  • The ground spot changes from white or pale green to cream or yellow
  • The rind becomes duller rather than glossy
  • The skin becomes firmer and more resistant to scratching
  • The fruit produces a deeper sound when tapped
  • The expected maturity period has elapsed
Use several ripeness indicators together. Tapping alone is subjective and should not be the only test used to harvest watermelon.

How to Tell When a Watermelon Is Ripe

The ground spot is one of the most useful indicators. A mature watermelon generally develops a creamy yellow area where the fruit rested on the soil.

The nearest tendril should usually be dry and brown. The rind often becomes less glossy and the fruit feels heavy for its size.

A ripe watermelon may produce a low, resonant sound when tapped, although sound varies with fruit size, rind thickness and internal structure.

Will Watermelon Ripen After Picking?

Watermelon does not continue developing substantial sweetness after it is removed from the vine.

A fruit picked slightly early may soften or change internally, but it will not reliably develop the flavour and sugar level of a vine-ripened watermelon.

Harvest only after the fruit reaches physiological maturity. Unlike some rockmelons, watermelon should not be picked early with the expectation that it will become fully sweet indoors.

When to Harvest Rockmelon

Rockmelon generally develops several maturity indicators:

  • A strong sweet aroma develops near the blossom end
  • The rind changes from green towards tan, cream or the expected mature colour
  • The netting becomes raised and well defined
  • A separation line develops around the stem
  • The fruit begins slipping from the vine on varieties with full-slip maturity
  • The blossom end may yield slightly to gentle pressure

Harvest requirements vary according to variety and whether fruit will be eaten immediately or transported.

When to Harvest Honeydew Melon

Honeydew melons generally do not develop the same strong stem slip as many rockmelons.

Signs of maturity can include:

  • The rind changes from green towards cream, pale yellow or the expected mature colour
  • The surface develops a waxy appearance
  • The blossom end softens slightly
  • A mild sweet aroma develops
  • The fruit feels heavy for its size
  • The expected maturity period has elapsed

Check the product description for variety-specific indicators.

How to Harvest Watermelon and Melons

Use clean secateurs or a sharp knife rather than pulling fruit from the vine.

Leave a short section of stem attached to watermelon and honeydew where practical. Rockmelons that reach full slip may release naturally.

Handle fruit carefully to avoid:

  • Cracking
  • Bruising
  • Rind punctures
  • Stem-end damage
  • Contamination from wet soil

How to Protect Melons Resting on the Ground

Place a clean, dry barrier beneath developing fruit to reduce prolonged contact with wet soil.

Suitable supports include:

  • Dry straw
  • Timber boards
  • Tiles
  • Rigid mesh
  • Purpose-made fruit supports

Do not twist or roll fruit aggressively when placing material beneath it. Damage to the stem can stop development.

Watering Watermelon and Melon Plants

Melons require consistent moisture during vine growth, flowering, pollination and fruit expansion.

Water deeply into the root zone rather than applying frequent shallow moisture.

Important periods include:

  • Seedling establishment
  • Rapid vine growth
  • Flower development
  • Pollination and early fruit set
  • Fruit expansion

Reduce excessive watering as fruit approaches maturity where conditions permit. Sudden heavy watering after drought can contribute to fruit splitting.

Do not keep melon roots continually saturated. Poor drainage can cause weak growth, root disease and reduced fruit quality.

Feeding Watermelon and Melon Plants

Melons require fertile soil and balanced nutrition.

Excessive nitrogen can produce vigorous leaves and vines with delayed flowering or reduced fruit set.

Nutritional considerations include:

  • Suitable organic matter before planting
  • Balanced early nutrition
  • Adequate potassium during fruit development
  • Suitable soil pH
  • Micronutrients where soils are deficient
  • Regular feeding for container-grown crops

Use fertilisers according to their labels and avoid concentrated applications directly against stems or roots.

Can Watermelon Seeds Be Eaten?

Mature seeds from edible watermelons can be eaten after suitable cleaning and preparation.

However, seed sold for planting should not be consumed unless the product is specifically identified for food use.

Do not eat chemically treated planting seed. Treated seed must not be eaten, sprouted, used as food or fed to animals.

How to Store Whole Watermelon

Store whole, undamaged watermelon in a cool location away from direct sunlight.

Storage life depends on fruit maturity, rind condition and temperature. Inspect fruit for cracks, soft areas, mould or leaking juice.

Once cut, watermelon should be refrigerated promptly.

How to Store Cut Watermelon and Melon

Cover exposed fruit or place cut pieces in a sealed food-safe container and refrigerate.

For best quality:

  • Use clean cutting equipment
  • Refrigerate promptly after cutting
  • Keep cut fruit covered
  • Avoid leaving pieces at warm room temperature for extended periods
  • Discard fruit that becomes slimy, fermented, mouldy or unpleasant smelling

Can Watermelon Be Frozen?

Watermelon can be frozen, but its crisp texture softens after thawing.

Frozen watermelon is best used in:

  • Smoothies
  • Frozen drinks
  • Sorbets
  • Icy poles
  • Granita
  • Blended desserts

Rockmelon and honeydew can also be frozen for blended or cooked uses.

Common Watermelon and Melon Growing Problems

Poor Germination

Cold soil, waterlogging, deep sowing and damaged seed can reduce emergence.

Flowers but No Fruit

Plants may initially produce male flowers, or female flowers may receive insufficient pollen.

Small Fruit Falling

Poor pollination, heat, water stress and weak vines can cause fruit abortion.

Misshapen Fruit

Incomplete pollination can result in uneven fruit development.

Fruit Splitting

Sudden water uptake after dry conditions can contribute to cracking.

Fruit Rot

Prolonged contact with wet soil, rind damage and poor airflow can cause decay.

Packet and Bulk Watermelon and Melon Seeds

Home and Small-Scale Growers

Smaller seed quantities are suitable for household gardens and growers comparing several melon types.

  • Trial watermelon, rockmelon and honeydew
  • Select smaller fruit for household use
  • Choose bush varieties for reduced vine spread
  • Compare open-pollinated and hybrid melons

Market Gardens and Commercial Growers

Larger seed quantities can be more economical for scheduled fresh-market and wholesale production.

  • Suitable for repeated or larger plantings
  • Bulk quantities available across selected varieties
  • Useful for watermelon, rockmelon and honeydew markets
  • Compare fruit uniformity, maturity and saleable yield
Compare value by saleable fruit production. Germination, plant population, fruit number, average weight, sweetness, cracking, grading losses and harvest labour all affect the real cost of melon production.

Important Considerations for Commercial Growers

Commercial melon production requires varieties suited to the target fruit specification, climate, harvest method and distribution system.

Fruit Uniformity

Consistent size, shape, rind and flesh colour simplify grading, packing and retail presentation.

Maturity

Concentrated or extended harvest windows influence labour, transport and market scheduling.

Fruit Size

Large fruit maximises weight, while smaller melons can better suit household portions and retail convenience.

Rind Strength

Rind durability affects handling, transport damage and post-harvest losses.

Seed Treatment

Treated and untreated seed require different handling and must be clearly identified before planting.

Market Demand

Confirm demand for watermelon, rockmelon, honeydew, compact and specialty fruit before large sowings.

Conduct local production trials before large sowings. Germination, vine growth, fruit set, sweetness, maturity and disease performance can vary with variety, planting date, soil, irrigation and climate.

Frequently Asked Questions

What is the difference between watermelon, rockmelon and honeydew?

Watermelon has crisp, high-moisture flesh inside a firm rind. Rockmelon has aromatic flesh and a netted rind, while honeydew generally has smooth skin and mild green or pale flesh.

Is rockmelon the same as cantaloupe?

In Australian usage, rockmelon commonly refers to the netted aromatic melon known as cantaloupe or muskmelon in other countries.

What is the difference between rockmelon and honeydew?

Rockmelon generally has a netted rind and aromatic orange flesh. Honeydew usually has smoother skin and crisp pale green or white flesh.

Is cucamelon a watermelon?

No. Cucamelon is a separate small-fruited vine crop with grape-sized striped fruit and a cucumber-like flavour.

What is a bush watermelon?

A bush watermelon develops shorter, more compact vines than ordinary trailing watermelon varieties.

Which watermelon is suitable for a smaller garden?

Bush Jubilee provides a more compact growth habit, while Sugar Baby produces comparatively small fruit and can be easier to manage than large watermelon varieties.

How do you grow watermelon from seed?

Plant seeds approximately 2–3 cm deep in warm, free-draining soil. Provide full sun, reliable moisture, vine space and effective pollination.

When should watermelon be planted in Australia?

Plant after frost risk has passed and the soil is warm. Temperate growers generally sow in spring, while tropical growers often favour the dry season.

When should watermelon be planted in Brisbane?

Watermelon can generally be planted around Brisbane from late winter through summer, provided soil temperatures are warm and drainage is adequate.

When should watermelon be planted in Melbourne?

Plant around Melbourne from October to December once frost risk has passed and the soil has warmed.

How deep should watermelon seeds be planted?

Plant watermelon seeds approximately 2–3 cm deep and avoid cold or waterlogged soil.

How long do watermelon seeds take to germinate?

Watermelon seed commonly germinates within approximately 5–12 days under warm conditions.

Should watermelon seeds be soaked before planting?

Soaking is optional. Warm soil and consistent moderate moisture are more important than presoaking.

Can watermelon seedlings be transplanted?

Yes. Transplant seedlings while young, keep the root ball intact and avoid allowing plants to become severely pot-bound.

How far apart should watermelon plants be spaced?

Bush types may be spaced approximately 60–100 cm apart. Vigorous trailing watermelons may require 1.5–2.5 metres or more.

How much space does a watermelon vine need?

Many vines extend approximately 2–5 metres. Large vigorous varieties can grow farther under suitable conditions.

Can watermelon be grown in pots?

Yes, but use a compact or small-fruited variety and a container of approximately 50–100 litres or more.

Can watermelon grow on a trellis?

Small-fruited watermelon can be trellised on a strong structure, but each developing fruit should be supported with a sling.

Do watermelons need full sun?

Yes. Watermelon generally requires at least six to eight hours of direct sunlight for strong vines and sweet fruit.

Do watermelons need bees?

Bees are important for transferring pollen from male to female flowers and supporting complete fruit development.

How do you hand-pollinate watermelon?

Transfer pollen from a newly opened male flower to the centre of an open female flower during the morning.

Why are small watermelons falling off?

Poor pollination is the most common cause. Water stress, temperature extremes and weak plants can also cause young fruit to abort.

Should watermelon vines be pruned?

Pruning is optional. Remove damaged growth or vines extending into unsuitable areas, but retain enough healthy foliage to support and shade the fruit.

How long does watermelon take to grow?

Watermelon commonly requires approximately 70–110 days from sowing to mature fruit.

How long does watermelon take to mature after flowering?

A successfully pollinated watermelon commonly requires approximately 35–50 days to mature.

When should watermelon be harvested?

Harvest when the nearest tendril is dry, the ground spot is creamy yellow, the rind is dull and the expected maturity period has elapsed.

How can you tell when a watermelon is ripe?

Check the ground spot, nearest tendril, rind appearance, fruit weight and tapping sound. Use several indicators together.

Will watermelon ripen after picking?

Watermelon does not develop substantial additional sweetness after picking, so it should be harvested fully mature.

When should rockmelon be harvested?

Harvest when the fruit develops mature rind colour and aroma and begins separating from the stem where the variety has a slip stage.

When should honeydew melon be harvested?

Harvest when rind colour changes appropriately, the blossom end softens slightly and the fruit develops its mature aroma and appearance.

How should watermelon be harvested?

Cut the stem with clean secateurs or a knife rather than pulling the fruit from the vine.

Can watermelon seeds be eaten?

Mature edible-watermelon seeds can be prepared as food, but planting seed must not be eaten unless specifically identified for food use.

Can treated melon seed be eaten?

No. Chemically treated seed must not be eaten, sprouted, used as food or fed to animals.

How should whole watermelon be stored?

Store whole, undamaged watermelon in a cool location away from direct sunlight and inspect it for cracks or soft areas.

How long does cut watermelon last in the refrigerator?

Storage life varies with freshness and temperature. Keep cut fruit covered and refrigerated and discard it if it becomes slimy, fermented, mouldy or unpleasant smelling.

Can watermelon be frozen?

Yes, but thawed watermelon loses its crisp texture. Frozen pieces are best used for smoothies, sorbets and frozen drinks.

Why did my watermelon split?

Splitting can occur when dry soil is followed by heavy rain or sudden excessive watering.

Why is my watermelon misshapen?

Incomplete pollination is a common cause of uneven or misshapen watermelon fruit.

Can watermelon seeds be saved?

Yes, from suitable open-pollinated varieties. Allow fruit and seed to mature fully and isolate compatible varieties where seed purity is required.

Will watermelon cross with rockmelon or cucumber?

Watermelon does not normally cross with rockmelon or cucumber because they belong to different compatible crop groups. Different watermelon varieties can cross with one another.

Can seed be saved from an F1 honeydew?

Seed may form, but it will not reliably reproduce the original F1 hybrid or its uniform characteristics.

Are all Seedmart watermelon and melon seeds untreated?

No. Treatment status varies between products. Some current melon varieties are identified as treated with Thiram, while others are untreated. Review each product page before ordering.

Are all Seedmart watermelon and melon varieties open-pollinated?

No. The category includes both open-pollinated and F1 hybrid varieties. Check the individual product specifications for hybrid status and seed treatment.

Watermelon and melon seeds for Australian growers

Grow Watermelons and Melons in Packet or Bulk Quantities

Seedmart supplies watermelon and melon seed for household gardens, raised beds, market gardens and commercial fruit production. Choose compact and full-sized watermelons, aromatic rockmelons and green-fleshed or F1 honeydew varieties according to your climate, available space, preferred fruit and intended market.

Review the individual product pages for available pack sizes, vine habit, fruit characteristics, hybrid status, seed treatment and variety-specific planting information before ordering.